Move packaging scripts for docker and appimage into subdirectory.

- De-clutter the project root directory.

packaging/Dockerfile

@@ -0,0 +1,14 @@
+# Copyright (C) 2020 Andrew Hamilton. All rights reserved.
+# Licensed under the Artistic License 2.0.
+
+
+FROM ubuntu:impish
+
+RUN apt update && apt install -y git sudo
+RUN git clone https://github.com/ahamilton/eris
+RUN cd eris && git checkout 0f59e4339548de8bcccc3ebf85be9b2b49fd10f0
+RUN rm -rf eris/.git
+RUN DEBIAN_FRONTEND=noninteractive apt install -y tzdata
+RUN cd eris && ./install
+
+ENTRYPOINT ["eris"]